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Class Information
Number: 327/254
Name: Miscellaneous active electrical nonlinear devices, circuits, and systems > Signal converting, shaping, or generating > Phase shift by less than period of input > Quadrature related (i.e., 90 degrees)
Description: Subject matter wherein the phase shift control includes the state or condition of two related periodic functions or two related points separated by a quarter of a cycle or 90 electrical degrees.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7598787 |
Signal generation apparatus, frequency converting apparatus, and receiver |
Oct. 6, 2009 |
| 7576584 |
Clock generators for generation of in-phase and quadrature clock signals |
Aug. 18, 2009 |
| 7573338 |
Quadrature voltage controlled oscillator with automated phase control |
Aug. 11, 2009 |
| 7555051 |
Method and device for estimating IQ imbalance |
Jun. 30, 2009 |
| 7551013 |
Phase interpolation circuit and method of generating phase interpolation signal |
Jun. 23, 2009 |
| 7538594 |
Method for reducing delay difference of differential transmission and system thereof |
May. 26, 2009 |
| 7535277 |
Frequency dividing phase shift circuit |
May. 19, 2009 |
| 7453301 |
Method of and circuit for phase shifting a clock signal |
Nov. 18, 2008 |
| 7274922 |
Circuit arrangement for generating an IQ-signal |
Sep. 25, 2007 |
| 7132903 |
Noise-shielding, switch-controlled load circuitry for oscillators and the like |
Nov. 7, 2006 |
| 7081783 |
Method and apparatus for generating and controlling a multiphase clock |
Jul. 25, 2006 |
| 7079823 |
Band-pass filter with carrier frequency reduction |
Jul. 18, 2006 |
| 7075351 |
Method and apparatus for generating a multiphase clock |
Jul. 11, 2006 |
| 6995595 |
Direct conversion receiver having a DC offset eliminating function |
Feb. 7, 2006 |
| 6995593 |
Circuit for programmable stepless clock shifting |
Feb. 7, 2006 |
| 6982584 |
Phase quadrature and slaved working frequency signal generator |
Jan. 3, 2006 |
| 6963236 |
Method and apparatus for generating and controlling a quadrature clock |
Nov. 8, 2005 |
| 6944437 |
Electronically programmable multimode circuit |
Sep. 13, 2005 |
| 6917232 |
Method and apparatus for generating a quadrature clock |
Jul. 12, 2005 |
| 6903591 |
Phase shifter circuit |
Jun. 7, 2005 |
| 6873198 |
Tunable quadrature phase shifter |
Mar. 29, 2005 |
| 6867656 |
Self-dividing oscillators |
Mar. 15, 2005 |
| 6831497 |
Active quadrature signal generator using load having low-pass and high-pass filter characteristics |
Dec. 14, 2004 |
| 6812763 |
Automatic wideband quadrature frequency generator |
Nov. 2, 2004 |
| 6768364 |
Quadrature signal generation with phase error correction |
Jul. 27, 2004 |
| 6747499 |
Tunable quadrature phase shifter using an all-pass circuit |
Jun. 8, 2004 |
| 6680639 |
Phase shifting arrangement for generating mutually orthogonal signals |
Jan. 20, 2004 |
| 6661851 |
Bi-directional vector rotator |
Dec. 9, 2003 |
| 6642634 |
Vertical ramp wave generating circuit |
Nov. 4, 2003 |
| 6597211 |
Clock divider circuit producing 0.degree. and 90.degree. outputs with a 50% duty cycle |
Jul. 22, 2003 |
| 6580300 |
Polyphase signal generator |
Jun. 17, 2003 |
| 6531904 |
CIRCUIT CONFIGURATIONS HAVING A DELAY DEVICE, A MULTIPLIER, FILTER AND/OR A MASTER-SLAVE FLIP-FLOP FOR GENERATING: AN OUTPUT SIGNAL BEING ORTHOGONAL TO AN INPUT SIGNAL, AN OUTPUT SIGNAL HAVING |
Mar. 11, 2003 |
| 6529052 |
Frequency multiplier based on exclusive-or gate and frequency divider |
Mar. 4, 2003 |
| 6480049 |
Multiphase clock generator |
Nov. 12, 2002 |
| 6456143 |
Frequency multiplier circuit and semiconductor integrated circuit |
Sep. 24, 2002 |
| 6452434 |
Phase shifter circuit |
Sep. 17, 2002 |
| 6400778 |
DC-offset canceller |
Jun. 4, 2002 |
| 6369633 |
Quadrature signal generation system |
Apr. 9, 2002 |
| 6366148 |
Delay locked loop circuit and method for generating internal clock signal |
Apr. 2, 2002 |
| RE37452 |
At frequency phase shifting circuit for use in a quadrature clock generator |
Nov. 20, 2001 |
| 6313680 |
Phase splitter |
Nov. 6, 2001 |
| 6242953 |
Multiplexed synchronization circuits for switching frequency synthesized signals |
Jun. 5, 2001 |
| 6239661 |
Transmitter and an oscillator network for use in the transmitter |
May. 29, 2001 |
| 6222405 |
Apparatus and method for generating accurate quadrature over a frequency range |
Apr. 24, 2001 |
| 6160434 |
Ninety-degree phase shifter |
Dec. 12, 2000 |
| 6157235 |
Quadrature signal generator and method therefor |
Dec. 5, 2000 |
| 6078200 |
Clock signal generator |
Jun. 20, 2000 |
| 6052010 |
Circuit, apparatus and method for generating signals phase-separated by ninety degrees |
Apr. 18, 2000 |
| 5987072 |
Phase modulation scheme and apparatus |
Nov. 16, 1999 |
| 5963073 |
.pi./2 phase shifter |
Oct. 5, 1999 |
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